Air conditioning unit

Abstract

The utility model relates to an air conditioning unit, it includes outdoor unit, control box and the indoor unit of setting in each room, and outdoor unit includes compressor, four -way valve, outdoor heat exchanger and first bypass expansion valve, and control box includes first gas -liquid separator, and the output end of refrigerant inlet is connectable with compressor or outdoor heat exchanger through refrigerant pipeline, and the first end of each indoor unit is connectable with first refrigerant outlet, the input end of compressor or outdoor heat exchanger, and the second end of each indoor unit intercommunication, and all are connectable with outdoor heat exchanger or second refrigerant outlet, and the second end of indoor unit is provided with second bypass expansion valve between outdoor heat exchanger, and the application realizes the demand of various indoor space cooling, heating and part room cooling, part room heating multiple temperature adjustment mode on the basis of two pipe regulation air conditioning unit, and the installation cost is low, and the occupied space is small.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning equipment technology, and in particular relates to an air conditioning unit. Background Technology

[0002] Central air conditioning connects to multiple indoor spaces, each regulating the temperature of a relatively independent space. Different indoor spaces have different temperature control requirements. Generally, in order to meet the relatively independent cooling and heating needs of each indoor space, a three-pipe air conditioning unit is required. Compared to a two-pipe air conditioning unit, a three-pipe system adds one more pipe and more valves, resulting in a larger outdoor unit size, increased assembly difficulty, and a larger space requirement. Summary of the Invention

[0003] The purpose of this utility model is to provide an air conditioning unit to solve the problems in the existing technology that require a three-pipe air conditioning unit to meet the needs of independent cooling or heating of multiple indoor spaces. The three-pipe air conditioning unit has high internal piping complexity, large space occupation, and increased assembly difficulty.

[0004] To achieve the above-mentioned objectives, the present invention employs the following technical solution: This utility model proposes an air conditioning unit, which includes: An outdoor unit includes a compressor, a four-way valve, an outdoor heat exchanger, and a first bypass expansion valve connected by refrigerant piping, wherein the first bypass expansion valve is connected in parallel with the outdoor heat exchanger. The control box includes a first gas-liquid separator; the first gas-liquid separator has a refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet, and the refrigerant inlet can be selectively connected to the output end of the compressor or an outdoor heat exchanger through a refrigerant pipeline. The indoor units are installed in each compartment. The first end of each indoor unit can be selectively connected to the first refrigerant outlet, the compressor input end, or the outdoor heat exchanger. The second ends of each indoor unit are interconnected and can be selectively connected to the outdoor heat exchanger or the second refrigerant outlet. A second bypass expansion valve is provided between the second end of the indoor unit and the outdoor heat exchanger.

[0005] In some embodiments of this application, the first valve port of the four-way valve is connected to the output port of the compressor, the second valve port of the four-way valve is connected to the refrigerant inlet of the first gas-liquid separator through the first refrigerant main line, the third valve port of the four-way valve is connected to the input end of the compressor, the fourth valve port of the four-way valve is connected to one end of the outdoor heat exchanger through the second refrigerant main line, and the other end of the outdoor heat exchanger is connected to the second refrigerant outlet of the first gas-liquid separator through the third refrigerant main line.

[0006] The first valve port can be selectively connected to the second or fourth valve port, and the third valve port can be selectively connected to the fourth or second valve port to control the flow path of the high-temperature and high-pressure refrigerant output from the compressor's output end.

[0007] In some embodiments of this application, a first one-way valve is provided on the first refrigerant main line, which is used to control the refrigerant to be unidirectionally transported from the compressor to the refrigerant inlet; a second one-way valve is provided on the third refrigerant main line, which is used to control the refrigerant to be unidirectionally transported from the second refrigerant outlet to the outdoor heat exchanger.

[0008] In some embodiments of this application, a first refrigerant auxiliary line and a second refrigerant auxiliary line are provided between the first refrigerant main line and the third refrigerant main line. One end of the first refrigerant auxiliary line is connected between the refrigerant inlet and the first one-way valve, and the other end of the first refrigerant auxiliary line is connected between the second one-way valve and the outdoor heat exchanger. One end of the second refrigerant auxiliary line is connected between the second valve port and the first one-way valve, and the other end is connected between the outdoor expansion valve and the second one-way valve. A third one-way valve is provided on the first refrigerant auxiliary line to control the unidirectional delivery of refrigerant to the first refrigerant main line, and a fourth one-way valve is provided on the second refrigerant auxiliary line to control the unidirectional delivery of refrigerant to the first refrigerant main line.

[0009] In some embodiments of this application, a third refrigerant auxiliary line is provided between the second refrigerant main line and the third refrigerant main line, one end of the third refrigerant auxiliary line is connected between the second one-way valve and the outdoor heat exchanger, and the first bypass expansion valve is provided on the third refrigerant auxiliary line.

[0010] In some embodiments of this application, the second end of the indoor heat exchanger is connected to the second refrigerant outlet via a fourth refrigerant main line, and a fourth refrigerant auxiliary line is also provided between the fourth refrigerant main line and the third refrigerant main line, with the second bypass expansion valve located on the fourth refrigerant auxiliary line.

[0011] In some embodiments of this application, the indoor unit includes a first indoor unit, a second indoor unit, and a third indoor unit. Each of the first, second, and third indoor units includes an indoor heat exchanger and an indoor expansion valve. The first indoor unit is connected to the first refrigerant outlet via a first refrigerant branch, and a first shut-off valve is provided on the first refrigerant branch. The second indoor unit is connected to the first refrigerant outlet via a second refrigerant branch, and a second shut-off valve is provided on the second refrigerant branch. The third indoor unit is connected to the first refrigerant outlet via a third refrigerant branch, and a third shut-off valve is provided on the third refrigerant branch.

[0012] In some embodiments of this application, a first refrigerant branch is further provided between the first refrigerant branch and the third refrigerant main line, and a fourth shut-off valve is provided on the first refrigerant branch. A second refrigerant branch is further provided between the second refrigerant branch and the third refrigerant main line, and a fifth shut-off valve is provided on the second refrigerant branch. A third refrigerant branch is further provided between the third refrigerant branch and the third refrigerant main line, and a sixth shut-off valve is provided on the third refrigerant branch.

[0013] In some embodiments of this application, in heating mode, the four-way valve is configured such that the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port; the first shut-off valve, the second shut-off valve, and the third shut-off valve are configured to be in an open state, the fourth shut-off valve, the fifth shut-off valve, and the sixth shut-off valve are configured to be in a closed state, each of the indoor expansion valves and the second bypass expansion valve are configured to be in a fully open state, the outdoor expansion valve is configured to be in a throttling state, and the first bypass expansion valve is configured to be in a fully closed state. In cooling mode, the four-way valve is configured such that the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port; the first shut-off valve, the second shut-off valve, and the third shut-off valve are configured to be closed, the fourth shut-off valve, the fifth shut-off valve, and the sixth shut-off valve are configured to be open, each of the outdoor expansion valves is configured to be fully open, each of the indoor expansion valves is configured to be throttled, and the first bypass expansion valve and the second bypass expansion valve are configured to be fully closed.

[0014] In some embodiments of this application, under the primary heating mode, the four-way valve is configured such that the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port; the fourth shut-off valve, the second shut-off valve, and the third shut-off valve are configured to be in an open state, the first shut-off valve, the fifth shut-off valve, and the sixth shut-off valve are configured to be in a closed state, the indoor expansion valves corresponding to the second indoor unit and the third indoor unit, and the second bypass expansion valve are configured to be in a fully open state, the outdoor expansion valve and the indoor expansion valve corresponding to the first indoor unit are configured to be in a throttling state, and the first bypass expansion valve is configured to be in a fully closed state; In the cooling-first mode, the four-way valve is configured such that the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port; the first shut-off valve, the fifth shut-off valve, and the sixth shut-off valve are configured to be in the open state, the fourth shut-off valve, the second shut-off valve, and the third shut-off valve are configured to be in the closed state, the second bypass expansion valve is configured to be in the fully closed state, the first bypass expansion valve, the outdoor expansion valve, and the indoor expansion valve corresponding to the first indoor unit are configured to be in the fully open state, the indoor expansion valves corresponding to the second indoor unit and the third indoor unit are configured to be in the throttling state, and the second bypass expansion valve is configured to be in the fully closed state.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are: The air conditioning unit involved in this application is an improvement on the two-pipe air conditioning unit by utilizing refrigerant pipelines and bypass expansion valves. It realizes the need for multiple temperature adjustment modes, such as simultaneous cooling and heating of each indoor space and partial cooling and heating of some rooms. Compared with the structure of a three-pipe unit, the air conditioning unit involved in this application has lower installation costs, occupies less space, and is more convenient to install and maintain.

[0016] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a diagram of an air conditioning unit system according to an embodiment; Figure 2 This is a schematic diagram of the four-way valve structure according to an embodiment; Figure 3 This is a schematic diagram of the outdoor unit configuration according to an embodiment; Figure 4 This is a schematic diagram of the control box according to an embodiment; Figure 5 This is a schematic diagram of the indoor unit components according to an embodiment; Figure 6 This is a schematic diagram of refrigerant flow in heating mode; Figure 7 This is a schematic diagram of refrigerant flow in cooling mode; Figure 8A schematic diagram of refrigerant flow in the primary heating mode; Figure 9 A schematic diagram of refrigerant flow in the cooling-dominant mode; Figure label: 10. First refrigerant main line; 11. First check valve; 20. Second refrigerant main road; 30. Third refrigerant main circuit; 31. Second check valve; 40. Fourth refrigerant main road; 50. First refrigerant auxiliary circuit; 51. Third check valve; 60. Second refrigerant auxiliary circuit; 61. Fourth check valve; 70. Third refrigerant auxiliary circuit; 71. First bypass expansion valve; 80. Fourth refrigerant auxiliary circuit; 81. Second bypass expansion valve; 100. Compressor; 110. Second gas-liquid separator; 120. Four-way valve; 121. First valve port; 122. Second valve port; 123. Third valve port; 124. Fourth valve port; 200. Outdoor heat exchanger; 210. Outdoor fan; 220. Outdoor electronic expansion valve; 300. First gas-liquid separator; 400. Indoor unit; 410. First indoor heat exchanger; 411. First indoor expansion valve; 420. Second indoor heat exchanger; 421. Second indoor expansion valve; 430. Third indoor heat exchanger; 431. Third indoor expansion valve; 440, First refrigerant branch; 441, First shut-off valve; 450. Second refrigerant branch; 451. Second shut-off valve; 460. Third refrigerant branch; 461. Third shut-off valve; 470. First refrigerant branch line; 471. Fourth shut-off valve; 480. Second refrigerant branch line; 481. Fifth shut-off valve; 490. Third refrigerant branch; 491. Sixth shut-off valve. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] In this application, the air conditioner performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0026] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0027] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0028] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0029] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0030] refer to Figures 1-5 An air conditioning unit includes an outdoor unit, a control box, and indoor units 400 installed in various rooms.

[0031] The outdoor unit includes a compressor 100, a four-way valve 120, an outdoor heat exchanger 200, and a first bypass expansion valve 71, all connected via refrigerant piping. The outdoor heat exchanger 200 is also connected to an outdoor expansion valve. A second gas-liquid separator 110 is installed at the input end of the compressor 100.

[0032] The first bypass expansion valve 71 is connected in parallel with the outdoor heat exchanger 200.

[0033] The control box includes a first gas-liquid separator 300; the first gas-liquid separator 300 has a refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet, and the refrigerant inlet can be selectively connected to the output end of the compressor 100 or the outdoor heat exchanger 200 through a refrigerant pipeline.

[0034] The refrigerant inlet is located at the top of the first gas-liquid separator 300, the first refrigerant outlet is located at the upper part of the first gas-liquid separator 300, and the second refrigerant outlet is located at the bottom of the first gas-liquid separator 300.

[0035] The first gas-liquid separator 300 separates the refrigerant supplied from the outdoor unit. The gaseous refrigerant gathers at the top of the first gas-liquid separator 300 and is discharged from the first refrigerant outlet, while the liquid refrigerant gathers at the bottom of the gas-liquid separator and is discharged from the second refrigerant outlet at the bottom.

[0036] Each compartment is equipped with an indoor unit 400 that operates independently. The first end of each indoor unit 400 can be selectively connected to the first refrigerant outlet, the input end of the compressor 100, or the outdoor heat exchanger 200. The second ends of each indoor unit 400 are interconnected and can be selectively connected to the outdoor heat exchanger 200 or the second refrigerant outlet. A second bypass expansion valve 81 is provided between the second end of the indoor unit 400 and the outdoor heat exchanger 200.

[0037] In some embodiments of this application, the first valve port 121 of the four-way valve 120 is connected to the output port of the compressor 100, the second valve port 122 of the four-way valve 120 is connected to the refrigerant inlet of the first gas-liquid separator 300 through the first refrigerant main line 10, the third valve port 123 of the four-way valve 120 is connected to the input end of the compressor 100, the fourth valve port 124 of the four-way valve 120 is connected to one end of the outdoor heat exchanger 200 through the second refrigerant main line 20, and the other end of the outdoor heat exchanger 200 is connected to the second refrigerant outlet of the first gas-liquid separator 300 through the third refrigerant main line 30.

[0038] The first valve port 121 is selectively connected to the second valve port 122 or the fourth valve port 124, and the third valve port 123 is selectively connected to the fourth valve port 124 or the second valve port 122 to control the flow path of the high-temperature and high-pressure refrigerant output from the output end of the compressor 100.

[0039] A first one-way valve 11 is provided on the first refrigerant main line 10. The first one-way valve 11 is used to control the one-way delivery of refrigerant from the compressor 100 to the refrigerant inlet.

[0040] A second one-way valve 31 is installed on the third refrigerant main line 30. The second one-way valve 31 is used to control the one-way delivery of refrigerant from the second refrigerant outlet to the outdoor heat exchanger 200.

[0041] The first bypass expansion valve 71 controls the flow of liquid refrigerant directly back to the outdoor unit; the pressure sensor on the fourth refrigerant line detects the pressure of the fourth refrigerant line and adjusts the opening of the first bypass expansion valve 71 to control the distribution of liquid refrigerant.

[0042] A first refrigerant auxiliary road 50 and a second refrigerant auxiliary road 60 are provided between the first refrigerant main road 10 and the third refrigerant main road 30.

[0043] One end of the first refrigerant auxiliary circuit 50 is connected between the refrigerant inlet and the first one-way valve 11, and the other end of the first refrigerant auxiliary circuit 50 is connected between the second one-way valve 31 and the outdoor heat exchanger 200. That is, the connection position between the first refrigerant auxiliary circuit 50 and the third refrigerant main circuit 30 is located at the end of the second one-way valve 31 near the outdoor heat exchanger 200.

[0044] One end of the second refrigerant auxiliary line 60 is connected between the second valve port 122 and the first one-way valve 11, and the other end is connected to the side of the second one-way valve 31 away from the outdoor heat exchanger 200.

[0045] A third check valve 51 is installed on the first refrigerant auxiliary line 50 to control the one-way delivery of refrigerant to the first refrigerant main line 10. A fourth check valve 61 is installed on the second refrigerant auxiliary line 60 to control the one-way delivery of refrigerant to the first refrigerant main line 10.

[0046] A third refrigerant auxiliary line 70 is provided between the second refrigerant main line 20 and the third refrigerant main line 30. One end of the third refrigerant auxiliary line 70 is connected between the second one-way valve 31 and the outdoor heat exchanger 200. The first bypass expansion valve 71 is provided on the third refrigerant auxiliary line 70.

[0047] The two ends of the third refrigerant auxiliary circuit 70 are located at the two ends of the outdoor heat exchanger 200 and the outdoor expansion valve, respectively, so that the outdoor heat exchanger 200, the outdoor expansion valve and the first bypass expansion valve 71 are connected in parallel.

[0048] Specifically, the second end of the indoor heat exchanger is connected to the second refrigerant outlet through the fourth refrigerant main line 40, the pressure switch is set on the fourth refrigerant main line 40, and a fourth refrigerant auxiliary line 80 is also provided between the fourth refrigerant main line 40 and the third refrigerant main line 30. The second bypass expansion valve 81 is set on the fourth refrigerant auxiliary line 80.

[0049] In some embodiments of this application, the air conditioning unit is connected to three independent rooms for temperature regulation of the three independent rooms. Of course, the air conditioning unit is not limited to being connected to three independent rooms; depending on the actual application, it can also be connected to multiple rooms.

[0050] The indoor unit 400 includes a first indoor unit 400, a second indoor unit 400, and a third indoor unit 400. Each of the first indoor unit 400, the second indoor unit 400, and the third indoor unit 400 includes an indoor heat exchanger and an indoor expansion valve.

[0051] For ease of understanding, the first indoor unit 400 is defined as including a first indoor heat exchanger 410 and a first indoor expansion valve 411; the second indoor unit 400 includes a second indoor heat exchanger 420 and a second indoor expansion valve 421; and the third indoor unit 400 includes a third indoor heat exchanger 430 and a third indoor expansion valve 431.

[0052] The first indoor unit 400 is connected to the first refrigerant outlet through the first refrigerant branch 440, and a first shut-off valve 441 is installed on the first refrigerant branch 440. The second indoor unit 400 is connected to the first refrigerant outlet through the second refrigerant branch 450, and a second shut-off valve 451 is installed on the second refrigerant branch 450. The third indoor unit 400 is connected to the first refrigerant outlet through the third refrigerant branch 460, and a third shut-off valve 461 is installed on the third refrigerant branch 460.

[0053] A first refrigerant branch line 470 is also provided between the first refrigerant branch line 440 and the third refrigerant main line 30. A fourth shut-off valve 471 is provided on the first refrigerant branch line 470. A second refrigerant branch line 480 is also provided between the second refrigerant branch line 450 and the third refrigerant main line 30. A fifth shut-off valve 481 is provided on the second refrigerant branch line 480. A third refrigerant branch line 490 is also provided between the third refrigerant branch line 460 and the third refrigerant main line 30. A sixth shut-off valve 491 is provided on the third refrigerant branch line 490.

[0054] In other words, the first shut-off valve 441 and the fourth shut-off valve 471 are connected in parallel, the second shut-off valve 451 and the fifth shut-off valve 481 are connected in parallel, and the third shut-off valve 461 and the sixth shut-off valve 491 are connected in parallel.

[0055] One end of the fourth refrigerant auxiliary circuit 80 is connected between the second refrigerant outlet and the indoor unit 400, and the other end is connected between the connection point of the second refrigerant auxiliary circuit 60 and the third refrigerant main circuit 30 and between each refrigerant branch circuit.

[0056] refer to Figure 6In heating mode, the first valve port 121 on the four-way valve 120 is connected to the second valve port 122, and the third valve port 123 is connected to the fourth valve port 124; the first shut-off valve 441, the second shut-off valve 451 and the third shut-off valve 461 are configured to be open, the fourth shut-off valve 471, the fifth shut-off valve 481 and the sixth shut-off valve 491 are configured to be closed, each indoor expansion valve and the second bypass expansion valve 81 are configured to be fully open, the outdoor expansion valve is configured to be throttled, and the first bypass expansion valve 71 is configured to be fully closed.

[0057] Specifically, in heating mode, all indoor heat exchangers in each compartment provide heating; that is, the first indoor heat exchanger 410, the second indoor heat exchanger 420, and the third indoor heat exchanger 430 all function as condensers.

[0058] The high-temperature and high-pressure refrigerant output from the compressor 100 passes through the first valve port 121 and the second valve port 122, then through the first refrigerant main line 10 and the first one-way valve 11, and is then transported from the refrigerant inlet to the first gas-liquid separator 300. Since the refrigerant entering the first gas-liquid separator 300 is all gaseous, the gaseous refrigerant in the first gas-liquid separator 300 is transported from the first refrigerant outlet through the first refrigerant branch line 440, the second refrigerant branch line 450 and the third refrigerant branch line 460 to the first indoor heat exchanger 410, the second indoor heat exchanger 420 and the third indoor heat exchanger 430 for heating.

[0059] After heating, the refrigerant in each indoor heat exchanger flows into the fourth refrigerant main line 40, and is then transported to the outdoor heat exchanger 200 via the fourth refrigerant auxiliary line 80 and the third refrigerant main line 30. Before entering the outdoor heat exchanger 200, the refrigerant is throttled by the outdoor expansion valve, and then evaporates and absorbs heat in the outdoor heat exchanger 200. Finally, it is returned to the compressor 100 via the second refrigerant main line 20, the fourth valve port 124, and the third valve port 123.

[0060] refer to Figure 7 In cooling mode, the first valve port 121 on the four-way valve 120 is connected to the fourth valve port 124, and the second valve port 122 is connected to the third valve port 123; the first shut-off valve 441, the second shut-off valve 451, and the third shut-off valve 461 are configured to be closed, the fourth shut-off valve 471, the fifth shut-off valve 481, and the sixth shut-off valve 491 are configured to be open, each outdoor expansion valve is configured to be fully open, each indoor expansion valve is configured to be throttled, and the first bypass expansion valve 71 and the second bypass expansion valve 81 are configured to be fully closed.

[0061] Specifically, in cooling mode, the indoor heat exchangers in each compartment are all cooled, that is, the first indoor heat exchanger 410, the second indoor heat exchanger 420 and the third indoor heat exchanger 430 all act as evaporators.

[0062] The high-temperature and high-pressure refrigerant output from the compressor 100 is transported from the fourth valve port 124 and the third valve port 123 through the second refrigerant main line 20 to the outdoor heat exchanger 200 for heat exchange. After heat exchange, the refrigerant is transported through the third refrigerant main line 30 and the first refrigerant auxiliary line 50 to the first gas-liquid separator 300. Since the refrigerant transported to the first gas-liquid separator 300 is all in liquid state, the liquid refrigerant is output from the second refrigerant outlet located at the bottom of the first gas-liquid separator 300.

[0063] The refrigerant output from the first gas-liquid separator 300 is delivered to each indoor heat exchanger via the fourth refrigerant main line 40.

[0064] Specifically, the refrigerant in the fourth refrigerant main circuit 40 is throttled by the first indoor expansion valve 411 and then transported to the first indoor heat exchanger 410 for heat exchange.

[0065] The refrigerant in the fourth refrigerant main line 40 is throttled by the second indoor expansion valve 421 and then transported to the second indoor heat exchanger 420 for heat exchange.

[0066] The refrigerant in the fourth refrigerant main circuit 40 is throttled by the expansion valve 431 in the third chamber and then transported to the heat exchanger 430 in the third chamber for heat exchange.

[0067] The refrigerant output from the first indoor heat exchanger 410 flows through the first refrigerant branch 470, the refrigerant output from the second indoor heat exchanger 420 flows through the second refrigerant branch 480, and the refrigerant output from the third indoor heat exchanger 430 flows through the third refrigerant branch 490 to the second refrigerant auxiliary branch 60. After passing through the second refrigerant auxiliary branch 60 and the first refrigerant main branch 10, it is returned to the compressor 100.

[0068] refer to Figure 8 In the heating-dominant mode, the number of heating rooms is greater than the number of cooling rooms. In this mode, the indoor heat exchanger corresponding to the heating room acts as the condenser, the indoor heat exchanger corresponding to the cooling room acts as the evaporator, and the outdoor heat exchanger 200 acts as the evaporator.

[0069] Taking the first room as a cooling room and the second and third rooms as heating rooms as an example, the refrigerant flow process in the heating-dominant mode is explained in detail: In the main heating mode, the first valve port 121 on the four-way valve 120 is connected to the second valve port 122, and the third valve port 123 is connected to the fourth valve port 124; the fourth shut-off valve 471, the second shut-off valve 451 and the third shut-off valve 461 are configured to be in the open state, and the first shut-off valve 441, the fifth shut-off valve 481 and the sixth shut-off valve 491 are configured to be in the closed state.

[0070] The indoor expansion valves and the second bypass expansion valve 81 corresponding to the second indoor unit 400 and the third indoor unit 400 are configured to be fully open, the outdoor expansion valve and the indoor expansion valve corresponding to the first indoor unit 400 are configured to be throttled, and the first bypass expansion valve 71 is configured to be fully closed.

[0071] The high-temperature and high-pressure refrigerant output from the compressor 100 passes through the first refrigerant main line 10 and the first one-way valve 11 via the first valve 121 and the second valve 122, and is then transported from the refrigerant inlet to the first gas-liquid separator 300. Since the refrigerant entering the first gas-liquid separator 300 is all gaseous and the first shut-off valve 441 is closed, the gaseous refrigerant in the first gas-liquid separator 300 is transported from the first refrigerant outlet through the second refrigerant branch line 450 and the third refrigerant branch line 460 to the second indoor heat exchanger 420 and the third indoor heat exchanger 430 for heating.

[0072] After heating, the refrigerant is divided into two paths. One path is throttled by the first indoor expansion valve 411 and then sent to the first indoor heat exchanger 410 for heat exchange. The refrigerant after heat exchange is sent from the first refrigerant branch path 470 to the third refrigerant main path 30. The other path is throttled by the second bypass expansion valve 81 after passing through the fourth refrigerant auxiliary path 80 and then merged into the third refrigerant main path 30. The refrigerant in the third refrigerant main path 30 is throttled again by the outdoor heat exchanger 200 and then sent to the outdoor heat exchanger 200 for evaporation and heat absorption. Finally, the refrigerant is sent back to the compressor 100 through the second refrigerant main path 20, the fourth valve port 124, and the third valve port 123.

[0073] refer to Figure 9 In the cooling-dominant mode, the number of cooling rooms is greater than the number of heating rooms. In this mode, the indoor heat exchanger corresponding to the heating room acts as the condenser, the indoor heat exchanger corresponding to the cooling room acts as the evaporator, and the outdoor heat exchanger 200 acts as the condenser.

[0074] Taking the first room as a heating room and the second and third rooms as cooling rooms as an example, the refrigerant flow process in the cooling-dominant mode is explained in detail: In the main cooling mode, the first valve port 121 on the four-way valve 120 is connected to the fourth valve port 124, and the second valve port 122 is connected to the third valve port 123; the first shut-off valve 441, the fifth shut-off valve 481, and the sixth shut-off valve 491 are configured to be open, the fourth shut-off valve 471, the second shut-off valve 451, and the third shut-off valve 461 are configured to be closed, the second bypass expansion valve 81 is configured to be fully closed, the first bypass expansion valve 71, the outdoor expansion valve, and the indoor expansion valve corresponding to the first indoor unit 400 are configured to be fully open, the indoor expansion valves corresponding to the second indoor unit 400 and the third indoor unit 400 are configured to be throttling, and the second bypass expansion valve 81 is configured to be fully closed.

[0075] The high-temperature and high-pressure refrigerant output from the compressor 100 is divided into two paths. One path is transported to the outdoor heat exchanger 200 through the second refrigerant main path 20 for heat exchange and then to the third refrigerant main path 30. The other path is merged into the third refrigerant main path 30 through the third refrigerant auxiliary path 70.

[0076] The third refrigerant main line 30 passes through the first refrigerant auxiliary line 50 and then through the first refrigerant main line 10 to the refrigerant inlet of the first gas-liquid separator 300. Since the refrigerant supplied to the first gas-liquid separator 300 is in both gas and liquid states, the gaseous refrigerant is supplied from the first refrigerant outlet through the first refrigerant branch line 440 to the first indoor heat exchanger 410 for heat exchange and then flows into the fourth refrigerant main line 40. The liquid refrigerant flows from the second refrigerant outlet and then passes through the second indoor expansion valve 421 and the third indoor expansion valve 431 for throttling before being supplied to the second indoor heat exchanger 420 and the third indoor heat exchanger 430 for heat exchange.

[0077] The refrigerant output from the second indoor heat exchanger 420 and the third indoor heat exchanger 430 flows through the second refrigerant branch 480 and the third refrigerant branch 490 respectively to the third refrigerant main line 30, and then flows back to the compressor 100 through the second refrigerant auxiliary line 60.

[0078] In some embodiments of this application, the opening degree of the expansion valve can also be adjusted according to the actual cooling or heating requirements; Specifically, in the heating-primary mode, the total heating demand is first calculated based on the needs of all heated rooms. Then, the frequency and heating output capacity of the compressor 100 are controlled, and the refrigerant enters the corresponding indoor heat exchanger to heat the room.

[0079] After passing through the indoor heat exchanger for heating, a portion of the refrigerant is throttled by the indoor electronic expansion valve for cooling, thus cooling the room. The total cooling demand is calculated based on the room's cooling needs, and the opening of the indoor unit's 400 electronic expansion valve is controlled to regulate the refrigerant flow.

[0080] The pressure sensor on the fourth refrigerant main line 40 detects the pressure value P. When P≥Po+∆P (Po is the target pressure, ∆P is the pressure offset), it indicates that the amount of refrigerant bypassed by the second bypass expansion valve 81 is too small, and the opening of the second bypass expansion valve 81 needs to be increased. When P≤Po-∆P, it indicates that the amount of refrigerant bypassed by the second bypass expansion valve 81 is too large, and the opening of the second bypass expansion valve 81 needs to be decreased.

[0081] In the cooling-first mode, the total cooling demand is first calculated based on the needs of all the rooms to be cooled, and then the frequency and cooling output capacity of the compressor 100 are controlled.

[0082] Calculate the total heating demand capacity based on the needs of all heated rooms, control the opening angle of the first bypass expansion valve 71 to ensure the amount of gaseous refrigerant entering the indoor heat exchanger, and open the outdoor expansion valve at a certain angle to control the amount of refrigerant flowing through the outdoor heat exchanger 200.

[0083] The pressure sensor detects the pressure value P. When P ≥ Po + ∆P, it means that the amount of refrigerant controlled by the outdoor expansion valve is too much, and the opening of the outdoor expansion valve needs to be reduced. When P ≤ Po - ∆P, it means that the amount of refrigerant controlled by the outdoor expansion valve is too little, and the opening of the outdoor expansion valve needs to be increased.

[0084] The air conditioning unit involved in this application utilizes refrigerant piping and a bypass expansion valve to achieve the needs of simultaneous cooling and heating of various indoor spaces, as well as multiple temperature adjustment modes such as partial cooling and partial heating of some rooms, based on a two-pipe air conditioning unit. It has low installation cost, small space occupation, and is more convenient for installation and maintenance.

[0085] Whenever possible, the various aspects and features described and shown in the specification can be applied individually, and these individual aspects can serve as the subject of a divisional application.

[0086] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0087] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An air conditioning unit, characterized in that, include: An outdoor unit includes a compressor, a four-way valve, an outdoor heat exchanger, and a first bypass expansion valve connected by refrigerant piping. The outdoor heat exchanger is also connected to an outdoor expansion valve, and the first bypass expansion valve is connected in parallel with the outdoor heat exchanger. The control box includes a first gas-liquid separator; the first gas-liquid separator has a refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet, and the refrigerant inlet can be selectively connected to the output end of the compressor or an outdoor heat exchanger through a refrigerant pipeline. The indoor units are installed in each compartment. The first end of each indoor unit can be selectively connected to the first refrigerant outlet, the compressor input end, or the outdoor heat exchanger. The second ends of each indoor unit are interconnected and can be selectively connected to the outdoor heat exchanger or the second refrigerant outlet. A second bypass expansion valve is provided between the second end of the indoor unit and the outdoor heat exchanger.

2. The air conditioning unit according to claim 1, characterized in that, The first valve port of the four-way valve is connected to the output port of the compressor, the second valve port of the four-way valve is connected to the refrigerant inlet of the first gas-liquid separator through the first refrigerant main line, the third valve port of the four-way valve is connected to the input end of the compressor, the fourth valve port of the four-way valve is connected to one end of the outdoor heat exchanger through the second refrigerant main line, and the other end of the outdoor heat exchanger is connected to the second refrigerant outlet of the first gas-liquid separator through the third refrigerant main line.

3. The air conditioning unit according to claim 2, characterized in that, A first one-way valve is provided on the first refrigerant main line, which is used to control the refrigerant to be transported unidirectionally from the compressor to the refrigerant inlet; a second one-way valve is provided on the third refrigerant main line, which is used to control the refrigerant to be transported unidirectionally from the second refrigerant outlet to the outdoor heat exchanger.

4. The air conditioning unit according to claim 3, characterized in that, A first refrigerant auxiliary line and a second refrigerant auxiliary line are provided between the first refrigerant main line and the third refrigerant main line. One end of the first refrigerant auxiliary line is connected between the refrigerant inlet and the first one-way valve, and the other end of the first refrigerant auxiliary line is connected between the second one-way valve and the outdoor heat exchanger. One end of the second refrigerant auxiliary line is connected between the second valve port and the first one-way valve, and the other end is connected between the outdoor expansion valve and the second one-way valve. A third one-way valve is provided on the first refrigerant auxiliary line to control the unidirectional delivery of refrigerant to the first refrigerant main line, and a fourth one-way valve is provided on the second refrigerant auxiliary line to control the unidirectional delivery of refrigerant to the first refrigerant main line.

5. The air conditioning unit according to claim 3, characterized in that, A third refrigerant auxiliary line is provided between the second refrigerant main line and the third refrigerant main line. One end of the third refrigerant auxiliary line is connected between the second one-way valve and the outdoor heat exchanger. The first bypass expansion valve is provided on the third refrigerant auxiliary line.

6. The air conditioning unit according to claim 5, characterized in that, The second end of the indoor unit is connected to the second refrigerant outlet through the fourth refrigerant main circuit. A fourth refrigerant auxiliary circuit is also provided between the fourth refrigerant main circuit and the third refrigerant main circuit. The second bypass expansion valve is located on the fourth refrigerant auxiliary circuit.

7. The air conditioning unit according to claim 2, characterized in that, The indoor unit includes a first indoor unit, a second indoor unit, and a third indoor unit. Each of the first, second, and third indoor units includes an indoor heat exchanger and an indoor expansion valve. The first indoor unit is connected to the first refrigerant outlet via a first refrigerant branch, and a first shut-off valve is provided on the first refrigerant branch. The second indoor unit is connected to the first refrigerant outlet via a second refrigerant branch, and a second shut-off valve is provided on the second refrigerant branch. The third indoor unit is connected to the first refrigerant outlet via a third refrigerant branch, and a third shut-off valve is provided on the third refrigerant branch.

8. The air conditioning unit according to claim 7, characterized in that, A first refrigerant branch is also provided between the first refrigerant branch and the third refrigerant main line, and a fourth shut-off valve is provided on the first refrigerant branch. A second refrigerant branch is also provided between the second refrigerant branch and the third refrigerant main line, and a fifth shut-off valve is provided on the second refrigerant branch. A third refrigerant branch is also provided between the third refrigerant branch and the third refrigerant main line, and a sixth shut-off valve is provided on the third refrigerant branch.

9. The air conditioning unit according to claim 8, characterized in that, In heating mode, the four-way valve is configured such that the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port; the first shut-off valve, the second shut-off valve, and the third shut-off valve are configured to be in the open state, the fourth shut-off valve, the fifth shut-off valve, and the sixth shut-off valve are configured to be in the closed state, each of the indoor expansion valves and the second bypass expansion valve are configured to be in the fully open state, the outdoor expansion valve is configured to be in the throttling state, and the first bypass expansion valve is configured to be in the fully closed state. In cooling mode, the four-way valve is configured such that the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port; the first shut-off valve, the second shut-off valve, and the third shut-off valve are configured to be closed, the fourth shut-off valve, the fifth shut-off valve, and the sixth shut-off valve are configured to be open, each of the outdoor expansion valves is configured to be fully open, each of the indoor expansion valves is configured to be throttled, and the first bypass expansion valve and the second bypass expansion valve are configured to be fully closed.

10. The air conditioning unit according to claim 8, characterized in that, In the primary heating mode, the four-way valve is configured such that the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port; the fourth shut-off valve, the second shut-off valve, and the third shut-off valve are configured to be in the open state, the first shut-off valve, the fifth shut-off valve, and the sixth shut-off valve are configured to be in the closed state, the indoor expansion valves corresponding to the second indoor unit and the third indoor unit, and the second bypass expansion valve are configured to be in the fully open state, the outdoor expansion valve and the indoor expansion valve corresponding to the first indoor unit are configured to be in the throttling state, and the first bypass expansion valve is configured to be in the fully closed state. In the cooling-first mode, the four-way valve is configured such that the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port; the first shut-off valve, the fifth shut-off valve, and the sixth shut-off valve are configured to be in the open state, the fourth shut-off valve, the second shut-off valve, and the third shut-off valve are configured to be in the closed state, the second bypass expansion valve is configured to be in the fully closed state, the first bypass expansion valve, the outdoor expansion valve, and the indoor expansion valve corresponding to the first indoor unit are configured to be in the fully open state, the indoor expansion valves corresponding to the second indoor unit and the third indoor unit are configured to be in the throttling state, and the second bypass expansion valve is configured to be in the fully closed state.

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